<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>

<!--卡片视图区域-->
    <el-card>
<!--      警告区域-->
      <el-alert
        title="注意！只允许第三级分类相关的参数"
        type="warning"
      :closable="false" show-icon>
      </el-alert>
<!--      选择商品分类区域-->
      <el-row  class="cat_opt">
        <el-col>
          <span>选择商品分类：
            <!--          选择商品分类的级联选择框-->
            <!-- options 用来指定数据源 -->
            <!-- props 用来指定配置对象 -->
          <el-cascader
            v-model="selectedCateKeys"
            :options="catelist"
            expandTrigger="hover"
            :props="cateProps"
            @change="handleChange"></el-cascader>
          </span>

        </el-col>
      </el-row>
      <!--tab页签区域-->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
<!--        添加动态参数的面板-->
        <el-tab-pane label="动态参数" name="many">
<!--          添加参数的按钮-->
          <el-button type="primary" size="mini"
                     :disabled="isBtnDisabled"
                     @click="addDialogVisible=true">添加参数</el-button>
<!--          动态参数表格-->
          <el-table :data="manyTableData" border stripe>

<!--            展开行-->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <el-tag v-for="(item,i) in scope.row.attr_vals"
                :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
<!--                循环渲染tag标签-->
<!--                输入文本框-->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
<!--                添加的按钮-->
                <el-button v-else class="button-new-tag"
                           size="small" @click="showInput(scope.row)">+ New Tag
                </el-button>

              </template>
            </el-table-column>
            <!--            索引列-->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name">
          </el-table-column>
            <el-table-column label="操作">
<!--              slot-scope="scope"-->
              <template>
                <el-button type="primary" icon="el-icon-edit" size="mini"
                           @click="showEditDialog">
                  编辑</el-button>
                <el-button  type="danger" icon="el-icon-delete"
                            size="mini" @click="removeParams(scope.row.attr_id)">
                  删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
<!--        添加静态属性的面板-->
        <el-tab-pane label="静态属性" name="only">
          <!--          添加属性的按钮-->
          <el-button type="primary" size="mini"
                     :disabled="isBtnDisabled"
                     @click="addDialogVisible=true">添加属性</el-button>
<!--          静态属性表格-->
          <el-table :data="onlyTableData" border stripe>
            <!--            索引列-->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <el-tag v-for="(item,i) in scope.row.attr_vals"
                        :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                <!--                循环渲染tag标签-->
                <!--                输入文本框-->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!--                添加的按钮-->
                <el-button v-else class="button-new-tag"
                           size="small" @click="showInput(scope.row)">+ New Tag
                </el-button>

              </template>
            </el-table-column>
            <el-table-column type="index"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name">
            </el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button type="primary" icon="el-icon-edit"
                           size="mini" @click="showEditDialog(scope.row.attr_id)">
                编辑</el-button>
                <el-button type="danger" icon="el-icon-delete"
                           size="mini" @click="removeParams(scope.row.attr_id)">
                  删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>

<!--    添加参数的对话框-->
    <el-dialog
      :title="'添加'+titleText"
      :visible.sync="addDialogVisible"
      width="50%" @close="addDialogClosed">
<!--      添加参数的对话框-->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef"
               label-width="100px" >
      <el-form-item :label="titleText" prop="attr_name">
        <el-input v-model="addForm.attr_name"></el-input>
      </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
    <el-button @click="addDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="addParams">确 定</el-button>
  </span>
    </el-dialog>

    <!--    修改参数的对话框-->
    <el-dialog
      :title="'修改'+titleText"
      :visible.sync="editDialogVisible"
      width="50%" @close="editDialogClosed">
      <!--      添加参数的对话框-->
      <el-form :model="editForm" :rules="editFormRules" ref="editFormRef"
               label-width="100px" >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
    <el-button @click="editDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="editParams">确 定</el-button>
  </span>
    </el-dialog>



  </div>
</template>

<script>
  export default {
    name: 'params',
    data(){
      return{
        catelist:[],
        // 级联选择框的配置对象
        cateProps:{
          value:'cat_id',
          label:'cat_name' ,
          children:'children',
        },
// 级联选择框双向绑定到的数组
        selectedCateKeys:[],
        //被激活的页签的名称
        activeName:'first',
        // 动态参数的数据
        manyTableData:[],
        // 静态参数的数据
        onlyTableData:[],
// 控制添加对话框的显示与隐藏
        addDialogVisible:false,
        // 表单绑定
        addForm:{
          attr_name:''
        },
        //添加表单的验证规则对象
        addFormRules:{
          attr_name:[
            {required:'true',message:'请输入参数：',trigger:'blur'}
            ]
        },
        // 控制编辑对话框的显示与暗藏
        editDialogVisible:false,
        // 修改的表单数据对象
        editForm:{},
        // 修改的表单数据对象规则
        editFormRules:{
          attr_name:[
            {required:'true',message:'请输入参数：',trigger:'blur'}
          ]
        },
        // 控制按钮与文本框的切换形式
        inputVisible:false,
        // 文本框中输入的内容
        inputValue:''
      }
    },
    created(){
      this.getCateList()
    },
    methods: {
      // 获取商品分类
      async getCateList () {
        const { data: res } = await this.$http.get('categories')
        if (res.meta.status !== 200) {
          return this.$message.error('获取分类信息失败')
        }
        this.catelist = res.data
        console.log(this.catelist)
      },
      // 级联选择框选中项变化，会触发这个函数
      handleChange () {
        this.getParamsData()
      },
      // 获取所有的参数项列表数据
      async getParamsData () {
        // 证明选中的不是三级分类
        if (this.selectedCateKeys.length !== 3) {
          this.selectedCateKeys = []
          this.manyTableData=[]
          this.onlyTableData=[]
          return
        }
        //反之选中的是三级分类
        console.log(this.selectedCateKeys)
        // 根据所选分类的Id，和当前所处的面板，获取对应的参数
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`,
          { params: { sel: this.activeName } })
        if (res.meta.status !== 200) {
          return this.$message.error('获取参数列表失败')
        }
        res.data.forEach(item=>{
          item.attr_vals=item.attr_vals?item.attr_vals.split(' '):[]
          // 控制文本框的显示与隐藏
          item.inputVisible=false
          //文本框中输入的值
          item.inputValue=''
        })


        console.log(res.data)
        if (this.activeName === 'many') {
          this.manyTableData = res.data
        } else {
          this.onlyTableData = res.data
        }
      },
      // tab页签点击函数的处理
      handleTabClick () {
        console.log(this.activeName)
        this.getParamsData()
      },
      // 监听对话框的关闭事件
      addDialogClosed () {
        this.$refs.addFormRef.resetFields()
      },
// 点击按钮，添加参数
      addParams () {
        this.$refs.addFormRef.validate(async valid => {
          if (!valid) return
          const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`,
            {
              attr_name: this.addForm.attr_name,
              attr_sel: this.activeName
            })
          if (res.meta.status !== 201) {
            return this.$message.error('添加参数失败')
          }
          this.$message.success('添加参数成功')
          this.addDialogVisible = false
          this.getParamsData()
        })

      },
      async showEditDialog(attr_id){
        // 查询当前参数的信息
        const{data:res}=await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,
          {params:{attr_sel:this.activeName}})
        if(res.meta.status!==200){
          return this.$message.error('查询参数信息失败')
        }
        this.editForm=res.data
        this.editDialogVisible=true
      },
      // 重置表单的操作
      editDialogClosed(){
        this.$refs.editFormRef.resetFields()
      },
      // 点击按钮，修改参数信息
      editParams(){
        this.$refs.editFormRef.validate(async valid=>{
          if(!valid) return
          const{data:res}=await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
            {attr_name:this.editForm.attr_name,attr_sel:this.activeName})
          if(res.meta.status!==200){
            return this.$message.error('修改参数失败')
          }
          this.$message.success('修改参数成功')
          this.getParamsData()
          this.editDialogVisible=false
        })


      },
      //点击按钮，删除参数信息
      async removeParams(attr_id){
        const confirmResult=await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).catch(err=>err)
        // 用户取消了删除操作
        if(confirmResult!=='confirm'){
          return this.$message.info('已经取消了删除操作')
        }
        // 删除的业务逻辑
        const{data:res}=await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)

        if(res.meta.status!==200){
          return this.$message.error('删除参数失败')
        }
        this.$message.success('删除参数成功')
        this.getParamsData()
      },
      // 文本框失去焦点,或者摁下enter都会触发
      async handleInputConfirm(row){
        if(row.inputValue.trim().length===0){
          row.inputValue=''
          row.inputVisible=false
          return
        }
        // 如果没有return,则证明输入的内容,需要做后续处理
        row.attr_vals.push(row.inputValue.trim())
        row.inputValue=''
        row.inputVisible=false
        // 需要发起请求保存这次的操作
        this.saveAttrVals(row)
      },
      // 将对attr_vals的操作保存到数据库
      async saveAttrVals(row){
        // 需要发起请求保存这次的操作
        const{data:res}=await this.$http.put(`categories/${this.cateId}
        /attributes/${row.attr_id}`,{
          attr_name:row.attr_name,
          attr_sel:row.attr_sel,
          attr_vals:row.attr_vals.join(' ')
        })
        if(res.meta.status!==200){
          return this.$message.error('修改参数项失败')
        }
        this.$message.success('添加参数成功')
      },
      // 点击按钮,展示文本输入框
      showInput(row){
        row.inputVisible=true
        // 让文本框自动获得焦点
        // $nextTick方法的作用,就是当页面上元素被重新渲染以后
        // 才会指定回调函数中的代码
        this.$nextTick(_ => {
          this.$refs.saveTagInput.$refs.input.focus();
        });
      },
//删除对应的参数可选项
      handleClose(i,row){
        row.attr_vals.splice(i,1)
        this.saveAttrVals(row)
      }
    },


    computed:{
      // 如果按钮需要被禁用，则返回true，否则返回false
      isBtnDisabled(){
        if(this.selectedCateKeys.length!==3){
          return true
        }
        return false
      },
      // 当前选中的三级分类的id
      cateId(){
        if(this.selectedCateKeys.length===3){
          return this.selectedCateKeys[2]
        }
        return null
      },
      // 动态计算标题的文本
      titleText(){
        if(this.activeName==='many'){
          return '动态参数'
        }
        return '静态属性'
      }
    }
  }
</script>

<style scoped>
  .cat_opt{
    margin :15px
  }
  .el-cascader{
    margin :15px
  }
  .el-input{
    width:120px
  }
  .el-tag{
    margin :15px
  }
</style>
